1240212217 has 2 divisors, whose sum is σ = 1240212218. Its totient is φ = 1240212216.

The previous prime is 1240212199. The next prime is 1240212227. The reversal of 1240212217 is 7122120421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1037548521 + 202663696 = 32211^2 + 14236^2 .

It is a cyclic number.

It is not a de Polignac number, because 1240212217 - 2⁷ = 1240212089 is a prime.

It is not a weakly prime, because it can be changed into another prime (1240212227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 620106108 + 620106109.

It is an arithmetic number, because the mean of its divisors is an integer number (620106109).

Almost surely, 2^1240212217 is an apocalyptic number.

It is an amenable number.

1240212217 is a deficient number, since it is larger than the sum of its proper divisors (1).

1240212217 is an equidigital number, since it uses as much as digits as its factorization.

1240212217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 448, while the sum is 22.

The square root of 1240212217 is about 35216.6468733183. The cubic root of 1240212217 is about 1074.3983558236.

Adding to 1240212217 its reverse (7122120421), we get a palindrome (8362332638).

The spelling of 1240212217 in words is "one billion, two hundred forty million, two hundred twelve thousand, two hundred seventeen".